Hard to beat the 833A for sheer size in an audio amplifier. 300W of DHT dissipation without forced air cooling...
My tubes are bigger than yours
- Thread starter BirdOnAWire
- Start date
What type number are they?
Lavane
Lunatic Member
Those make octal tubes look so tiny.
Pio1980
AK Member
Pio1980
AK Member
Pio1980
AK Member
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Not as powerful, if I recall.
RF, as you know PIO, is some fun stuff. Got my first CB at 8 y/o, first RF burn from a 100W linear at 10, general HAM license in '76 at 12.
Good times. I've been thinking lately I may want to venture back into it.
You're just a stones throw away. We could chat.
Pio1980
AK Member
Coffee somewhere sometime, lunch?Not as powerful, if I recall.
RF, as you know PIO, is some fun stuff. Got my first CB at 8 y/o, first RF burn from a 100W linear at 10, general HAM license in '76 at 12.
Good times. I've been thinking lately I may want to venture back into it.
You're just a stones throw away. We could chat.
What's your 20?
Lavane
Lunatic Member
I almost built a phono preamp with the mind's. But after seeing grommets needed to be used on them due to being microphonic I decided against it.
Pio1980
AK Member
Wouldn't take much to breadboard for a funzies trial, and make a fun thread.
4 of the smaller ones should run on a 1.5 Aalkaline cell and a couple or three 9 volt batteries in series.
Quite possibly, someone has done it.
Pio1980
AK Member
Used to see these offered @ hamfests relatively cheap as display items.
Dunno what they do class-A audio.
Lavane
Lunatic Member
They have. It used 4 tiny tubes.
Pio1980
AK Member
I do know milsurp sub-minis have been employed in projects, the Russian "rod" milsurp sub-minis have had some interest as project tubes. There's some milsurp twin triode sub's that should be good as a stereo pair that I recall from my 1960s HAWK missile days.
Pio1980
AK Member
The linked article refers to green medium persistence phosphor display in early crt TV development. Here are a couple ouple very rare surviving restored first RCA crt field test receiver;
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Have to say, never seen one of those posted on here before.
Lavane
Lunatic Member
Those with a mirror to watch it is crazy.
An old high school friends father was retired from PG&E, a huge power company here in Cali. He had a nice out building where he restored really early TV's. I used to spend some time there watching and talking to him and watching some of his restored TV's. One of my favorite was an old table top Emerson. It has the clearest picture of my B&W TV I ever saw.
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Pio1980
AK Member
Wonder which Emerson that was.
GE originated the aluminized "Daylight" CRT with the 10FP4, I had a GE with one once, it became standard for all TV CRTs in a few years as clearly superior to those without, that lost more than 50% of the image brightness into the rear of the CRT. Relatively scarce 10FP4s are sought out as replacements for 10BP4 for their superior contrast and brightness, maybe the Emerson had one as a replacement?
Also had a 1939 RCA mirror set with a uselessly tired CRT that was otherwise neet, and a later Stewart Warner console mirror TV, another neet set that worked.
Looked like this;
(Pic of set for sale)
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Wavac rated their 833A monos at 150W "effective" power each. Only $350K for a pair!
Pio1980
AK Member
"Effective"?
Wonder what that is true measured RMS?